[llvm] [AArch64] Adjust costs for masked CompressStore and ExpandLoad (PR #226950)

[via llvm-commits]

llvmorg-github-actions[bot] wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-backend-aarch64

Author: Jack Styles (Stylie777)

<details>
<summary>Changes</summary>

Currently, costs for the `llvm.expand.compressstore` and `llvm.masked.expandload` are costs simply at 2 x the type legalization cost. However, this does not properly represent the instructions that are generated for these intrinsics.

The costs have been adjusted to better represent the cost of using these intrinsics with SVE Instructions.

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Full diff: https://github.com/llvm/llvm-project/pull/226950.diff


3 Files Affected:

- (modified) llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp (+8-2) 
- (modified) llvm/test/Analysis/CostModel/AArch64/masked_compress_load.ll (+85-85) 
- (modified) llvm/test/Analysis/CostModel/AArch64/masked_expand_load.ll (+108-108) 


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</details>


https://github.com/llvm/llvm-project/pull/226950